I have intention to install on the back bumper of my car a sensor that detects the obstacles; the last time I was reversing I did 250 $ of damage, therefore sailing on internet I found two typologies of sensor: one with four ultrasonic transducers, and another with only an aluminium tape. Owing to the fact that I have not intention to do holes on my bumper I would prefer the second invisible solution. For this reason I wish ask first a your opinion.
Here is the link of the producer: Electromagnetic Parking Sensor PROXEL

Well, as far as I'm concerned, it's always better to go with the mainstream solution. I remember seeing ads for Autobarn and Super Cheap Auto for these kits, and I remember thinking it was cheap. If it's a classic car and you don't want to drill a hole in the shell then I can understand, but if it is a newer car with a crappy plastic bumper bar (eg. Daewoo), then go for it. The value of the car will go up, and after taking a quick look at the other "sticky tape" one, that looks like a total waste of time to be honest. So, I'd go for the original version where they sit in holes in your bumper. Just my opinion though, I've never had parking sensors and really no experience with them either.

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